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Subject: Pump base bolt torque specs

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Travis Webb (UT)    Posted 04-19-2020 at 23:21:22 [URL] [DELETE]        [Reply] [Email]  
  • Pump base bolt torque specs
  • 8N hydraulic pump replacement; the I&T manual says to torque the bolts to 53-60 ft lbs. Is that for the cast iron pump base, or the aluminum base? Or both? I donít want to crack the new base...

    Tim Daley(MI)    Posted 04-20-2020 at 05:23:50 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Pump base bolt torque specs
  • Travis-
    BOTH. Torque is applied to the FASTENER, not the part that it is fastened to. The pump base is secured with part number 355693-S7, 7/16-14 x 1-3/8" Hex head bolts with a plain steel flat washer (p/n 351428-S7) used only with the aluminum base. You are torquing the bolt.

    Tim Daley(MI)

    Travis Webb (UT)    Posted 04-20-2020 at 15:23:28 [URL] [DELETE]        [Reply] [Email]  
  • Re: Pump base bolt torque specs
  • Thanks Tim. The pump I removed is stamped with part number 8N605B; the one I bought is 8N605A, but I can't get it to sit right so the bolts will thread in. Did I buy the right part number, or is there a trick to getting the new pump in? I tried putting the old pump back in, and it fit right in with no problems, so I'm thinking I have the wrong part number. I can't find anything online for a 'B' part number though.

    Tim Daley(MI)    Posted 04-20-2020 at 17:56:28 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Pump base bolt torque specs
  • You are looking at casting numbers, not the assembly numbers. You won't find any FORD assembly numbers anywhere, only individual casting part numbers. If you are seeing the 8N prefix codes, most likely they are OEM original parts. They should fit and swap out with each other. The SEP 1952 MPC lists the assembly numbers as: 8N-604-A; aluminum; and 8N-604-B; cast iron. FORD wouldn't have changed the bolt pattern on the pump or center housing. Get your manuals and look at parts diagrams and the FO-4 manual for installation instructions. How far off is the alignment? Is it just one hole or the whole pattern?

    FORD 8N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS:


    Tim Daley(MI)

    Travis Webb (UT)    Posted 04-20-2020 at 19:21:37 [URL] [DELETE]        [Reply] [Email]  
  • Re: Pump base bolt torque specs
  • The MPC lists the part as 8N604-A2 or 8N604-B. The I&T manual lists the part as 8N605B. The Service Manual just says "605".

    The new pump I bought is an 8N605A, and measures L: 10 5/8" W: 8 3/4" The old pump I had in it says "8N605 Bohnalite" on the bottom, and measures L: 10 1/2" W: 8 11/16". Also, on the new pump, the distance from the bolt holes to the outer edge is longer than on the old pump. I'm pretty sure the new pump is wrong, but with two manuals saying two different part numbers, I'm confused. I can send pics if that would help.

    Tim Daley(MI)    Posted 04-21-2020 at 05:56:18 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Pump base bolt torque specs
  • Measure or match up the bolt hole pattern, don't go by o/a widths or lengths or measuring from edges. If you have an aftermarket pump, is there one, I've never seen one, then that could be the problem. What is wrong with the pump you had originally? If not cracked, can be rebuilt. Where did you get the one that doesn't 'fit'? The suffix "A' denotes aluminum, and the 'B' suffix denotes cast iron as listed in the MPC. The '2' on the 'A2' denotes an alternate supplier, but the design wouldn't change. I'm saying FORD didn't, wouldn't have made two different parts without reason. Not only would the base have to change, the center housing would have to as well. If they did, I never heard of it and don't see anything in the MPC do verify they were. maybe Scott can chime in. Do you have a 7/16-14 tap? Send me some pictures.

    Tim Daley(MI)

    Travis Webb (UT)    Posted 04-21-2020 at 19:57:47 [URL] [DELETE]        [Reply] [Email]  
  • Re: Pump base bolt torque specs
  • Lining the pumps up side by side, the bolt holes seem to line up; however when it was in the tractor, I needed to move the pump about 1/4" to the right, to line up the holes on the center housing, and it wouldn't move. I shouldn't need to take the top lid off should I? Also, one thing I forgot to mention...the PTO shaft does not go in to the new pump as easy as it should. It would slide in and out of the old pump with no problem at all; I had to hammer it in to the new one pretty aggressively. (I didn't damage anything with the splines). Possibly a defective unit?

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